| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 14 October 1922 |
| Designations | |
| (985) Rosina | |
Named after | A girl's name picked from a popular Germancalendar[2] |
| 1922 MO | |
| Mars crosser[1][3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 94.37 yr (34,467 days) |
| Aphelion | 2.9380AU |
| Perihelion | 1.6604 AU |
| 2.2992 AU | |
| Eccentricity | 0.2778 |
| 3.49yr (1,273 days) | |
| 92.838° | |
| 0° 16m 57.72s / day | |
| Inclination | 4.0564° |
| 290.33° | |
| 59.636° | |
| Earth MOID | 0.6583 AU · 256.5LD |
| Physical characteristics | |
| Dimensions | 8.18 km(calculated)[4] |
| 3.012±0.001h[5] 3.0126±0.0002 h[6] | |
| 0.20(assumed)[4] | |
| SMASS =S[1][4] · S[7][8] | |
| 12.70[8] · 12.8[1][4] · 13.05±0.30[7] | |
985 Rosina, provisional designation1922 MO, is a stonyasteroid and sizableMars-crosser on an eccentric orbit from the inner regions of theasteroid belt, approximately 8 kilometers in diameter. It was discovered on 14 October 1922, by astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in Germany.[3] The asteroid's name is a common German female name, unrelated to the discoverer's contemporaries.[2]
Rosina is aMars-crossing asteroid, a dynamically unstable group between themain belt and thenear-Earth populations, crossing the orbit of Mars at 1.666 AU.[1][3]
It orbits the Sun in theinner main-belt at a distance of 1.7–2.9 AU once every 3 years and 6 months (1,273 days). Its orbit has aneccentricity of 0.28 and aninclination of 4° with respect to theecliptic.[1] The body'sobservation arc begins atVienna Observatory, eight days after its official discovery observation at Heidelberg.[3]
In theSMASS classification,Rosina is a stonyS-type asteroid.[1] It has also been characterized as such byPan-STARRS andSDSS.[7][8]
Two rotationallightcurves ofRosina were obtained from photometric observations. Lightcurve analysis gave a well-definedrotation period of 3.012 and 3.0126 hours with an identical brightness amplitude of 0.22magnitude (U=3/3).[5][6]
TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.18 kilometers based on anabsolute magnitude of 12.8.[4]
Thisminor planet was named after a girl's name picked from the German popularcalendarDer Lahrer hinkende Bote.(de)
As with913 Otila,997 Priska and1144 Oda, Reinmuth selected names from this calendar due to his many asteroid discoveries that he had trouble thinking of proper names. These names are not related to the discoverer's contemporaries. The author of theDictionary of Minor Planet Names learned about Reinmuth's source of inspiration from private communications with Dutch astronomerIngrid van Houten-Groeneveld, who worked as a young astronomer at Heidelberg.[2]
